diff --git a/housekeeping/src/main/groovy/whelk/HouseKeepingServer.java b/housekeeping/src/main/groovy/whelk/HouseKeepingServer.java
index 54048228d0..fa8aefa0b0 100644
--- a/housekeeping/src/main/groovy/whelk/HouseKeepingServer.java
+++ b/housekeeping/src/main/groovy/whelk/HouseKeepingServer.java
@@ -77,6 +77,6 @@ protected void doFilter(HttpServletRequest req, HttpServletResponse res, FilterC
     }
 
     public static void main(String[] args) throws Exception {
-         new HouseKeepingServer().run();
+        new HouseKeepingServer().run();
     }
 }
diff --git a/whelktool/src/main/groovy/whelk/datatool/WhelkTool.groovy b/whelktool/src/main/groovy/whelk/datatool/WhelkTool.groovy
index d50e8062cd..a20c32fa45 100644
--- a/whelktool/src/main/groovy/whelk/datatool/WhelkTool.groovy
+++ b/whelktool/src/main/groovy/whelk/datatool/WhelkTool.groovy
@@ -2,6 +2,7 @@ package whelk.datatool
 
 import com.google.common.util.concurrent.MoreExecutors
 import groovy.transform.Immutable
+import org.apache.logging.log4j.Logger
 import org.codehaus.groovy.jsr223.GroovyScriptEngineImpl
 import whelk.Document
 import whelk.IdGenerator
@@ -71,6 +72,7 @@ class WhelkTool {
     PrintWriter createdLog
     PrintWriter deletedLog
     ConcurrentHashMap<String, PrintWriter> reports = new ConcurrentHashMap<>()
+    Logger logger
 
     Counter counter = new Counter()
 
@@ -428,9 +430,9 @@ class WhelkTool {
             var newGlobals = bindings.keySet() - globals
             if (newGlobals) {
                 String msg = "FORBIDDEN - new bindings detected: ${newGlobals}"
-                System.err.println(msg)
-                System.err.println("Adding new global bindings during record processing is forbidden (since they share state across threads).")
-                System.err.println("Aborting.")
+                log(msg)
+                log("Adding new global bindings during record processing is forbidden (since they share state across threads).")
+                log("Aborting.")
                 errorDetected = new Exception(msg)
                 return false
             }
@@ -741,8 +743,13 @@ class WhelkTool {
     }
 
     private void log(String msg) {
+        if (logger) {
+            logger.info(msg)
+        } else {
+            System.err.println(msg)
+        }
+
         mainLog.println(msg)
-        System.err.println(msg)
     }
 
     private void repeat(String msg) {
diff --git a/whelktool/src/main/java/whelk/datatool/bulkchange/BulkPreviewJob.java b/whelktool/src/main/java/whelk/datatool/bulkchange/BulkPreviewJob.java
index 0c0e5efa08..a9bdefe4a4 100644
--- a/whelktool/src/main/java/whelk/datatool/bulkchange/BulkPreviewJob.java
+++ b/whelktool/src/main/java/whelk/datatool/bulkchange/BulkPreviewJob.java
@@ -30,6 +30,7 @@ public BulkPreviewJob(Whelk whelk, String id) throws IOException {
         tool.setDryRun(true);
         tool.setRecordChanges(true);
         tool.setRecordingLimit(RECORD_MAX_ITEMS);
+        tool.setLogger(log);
     }
 
     public boolean isFinished() {